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7.5 AMP IMPACT WRENCH 11
OPERATING INSTRUCTIONS
4. Impacting Tips
The proper fastening torque may differ depending on the type or size of the bolt, the
material of the workpiece to be fastened, etc.
NOTICE: Hold the tool sop that the socket is straight along the axis of the bolt or nut.
a. Excessive fastening torque may damage the bolt/nut or socket. Before starting your
job, always perform a test operation to determine the proper fastening time for
your bolt or nut. Practice with various fasteners, noting the length of time required
to reach the desired torque. Check the tightness with a hand-torque wrench. If
the fasteners are too tight, reduce the impacting time. If they are not tight enough,
increase the impacting time.
b. Hold the tool firmly, and place the socket over the bolt or nut. Turn the tool on, and
fasten the bolt or nut to the proper torque.
c. The torque that is required to loosen a fastener averages 75% to 80% of the
tightening torque, depending on the condition of the contacting surfaces. However, if
rust or corrosion causes seizing, more torque may be required.
d. After fastening, always check the torque with a torque wrench. The fastening torque
is affected by a wide variety of factors, including the following:
• Voltage
A voltage reduction will cause a reduction in the fastening torque.
• Socket
Failure to use the correct size socket will cause a reduction in the fastening torque. A
worn socket (wear on the hex end or square end) will cause a reduction in the fasten-
ing torque.
• Bolt
Although the torque coefficient and the class of bolt may be the same, the proper
fastening torque will differ according to the diameter of the bolt.
Even if the diameters of bolts are the same, the proper fastening torque will differ
according to the torque coefficient, the class of bolt and the bolt length.
• The use of a universal joint or an extension bar (both available separately) will
reduce the fastening force of the impact wrench somewhat. Compensate by
fastening for a longer period of time.
• The manner of holding the tool or the material to be fastened will affect the torque.
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